Game mode: [Online]
Problem: [| Bug | Performance]
Region: [Europe]
Some wild NPCs just don’t want to attack, even if you already attack them, they sometimes just stand still and decide to defend themselves only after some time.
Are you on a server or just playing local? If it’s a server, that’s a symptom of connection lag. I’d recommend a relog if you haven’t already, or contact the server admin about restarting the server.
I agree with Jimbo, this is typically indicative of poorly performing server…either your own machine or the remote server you’re playing on. A reboot will likely fix it. Most servers have one or more daily reboots to keep these problems minimized.